Packing for pistons and the like.



io ing a part of the same.

the inner side of the oylinder, thereby preder, but it will be understood that it may horizontal section taken on the line 2-2- of of the cylinder.

' o chamber and F the supply pipe.

40 threaded on to the part 2 of the plunger.

Secured the fiat portion of the cup-shaped UTED STATES FCE,

GEORGE A. PEARSE, JE., or' NEW YORK, N. Y.

PACKING FOR PISTONS AND THE LIKE.

951,333. Specfication of Letters Patent. Patented Mar 8 1910 Application filed March 29, 1909. Serial No. &SG/124.

To all whom 'it may concem:

Be it known that I, GEORGE A. PEARSE, Jr., a citizen of the United States, residing at New York city, County of New York, and State of New York, have invented certain new and useful Improvements in Packing tor Pistons and the Like, fully described and represented in the following specification and the accompanyng drawings, formbe used, are provided with plates 10, each of which, as shown in the drawing, extends around about one fourth of the inner periphery of the packing ring 6. The arms 9 are supported and guided at their outer ends by the wall 7 of the piston, and at their in-. ner ends by a cone-shaped block 11 forming a part of or Secured to the lower end of the plunger rod C. The part 1 of the plunger B is provided with a hub 12 through which passes the plunger rod C, the plunger rod being provided above the hub 12 with adj usting nuts 14.

The operation of the parts, as described, and shown, is as follows: As the plunger rod moves block 11 engages the inner ends of the arms 9 and forces them outwardly, the plates 10 impinging against and forcing the packing ring 6 against the inner wall of the cylinder A and preventing any leakage 7 ot air into the suction chamber E, so that a high vacuum may be formed in the said chamber and the maximum amount of water drawn in to the cylinder. When the arms 9 have been moved outward sufticiently to take up any looseness of the packing ring 6, the collar 13015 the plunger rod C engages the hub 12 and the plunger is moved upward to draw the water into the eylinder. The plunger rod C then makes its down stroke, the nuts 14: engaging the upper side of the hub l2 moving the plunger down forcing the water upwardly through the valve D into the cylinder over the plunger, an inlet valve (not shown) in the pipe F being closed at this time. The movement of the plunger rod to secure the desired outward movement of the plates 10 is very small and the distance away from the hub 12 of the collar 13 is regulated by the adjusting nuts 14 so that the oollar 13 will strike the hub 12 immediately after the paoking ring 6 has been forced tightly against the inner wall ot the cylinder. To prevent the arms 9 from being bent upward 3 and away from the block 11 when the plun- This invention relates to a plunger or pston packng whereby the wear or shrnkage of the packing s compensated :tor and a tght fit msured between the packng and venting leakage of fluid between the sides of the plunger and eylinder.

The invention is shown in the drawings as applied to the plunger of a pump cylinbe readily applied to steam or water pstons. In the drawings forming a part of this specificatiom-Fgure 1 s a vertical section of a part of a pump cylnder. Fg. 2 lS a Fig. l, showing a plan view of the plunger. Fig. 3 is a section taken on the line 3-3 of Fig. 1, and showing the means for expanding or forcing the packing against the side Referring to Fig. 1, A indicates the pump cylinder, and B the pump plunger or piston, as the case may be, C the plunger rod, D the inlet valve, and E the indue tion or' suction While the Construction ot the plunger D may be of any desired form, I have shown it as composed of two parts 1, 2, the upper part 1 being provided with an extension 3 This extension 3 is provided with the usual valve seat 4: of the inlet valve D as is .common to this form of pump. Between the upper and lower parts 1, 2 of the plunger B is packing 5, the packing ring 6 otthe packing resting against the inner wall of the ger makes 1ts down stroke,r1bs 15 are procylinder A. The part 1 of the plunger B vided, these I'llOS extendmg from the wall 7 has a central wall 7 somewhat smaller in inwardly and over the arms 9, as shown m 50 diameter than the packing ring 6 of the Figs. 1 and 4.

55 be understood that any packing 5, this extension 7 being provided While I have described and shown, what with Slots 8 through which are passed arms I cons der to be the preferred form of my 9. These arms 9, of which there are four, invention it Wlll be understood that the conas shown in the drawin s, although it will struction of the parts may be w1dely vared esired number may a, without departing from my invention.

What I claim is 2 l. A plunger or pisten provided With e paeking ring and means Whereby the pack ing ring is pressed against the inner surface of the eylinder by the plunger or piston rod at or before the beginning of the movement of said stantizlly as described.

2. The eombination With a plunger or pisten provided With a paeking ring' of a plurality of movubie phtes for engaging the inner surface of the paeking ring, and a piunger or pisten red adapted to move the said plates ontwardiy SO as to press the packing ring against the inner surface of the eylinder at or before the beginning' of the movement of the phinger or pisten, substantialiy as described.

3. The combination With u plunger or piston provided With a packin g ring, of :i plurality of radialiy movnble phtes, and ;i piston rod provided With a hub or block for engaging-the inner ende of said movable plates Whereby the (Inter ende of the said plates :rre forced into engtgement With the paeking ring to press the paeking ring against the inner surface of the eylinder nt or before 'the beginning of the movement of the phmger or pisten on the suetion stroke, snbstantially as described.

4. In a plnnger or piston provided With phinger or pisten, snba packing ring', the conbination of a pluraiity of movable plates having inwardly extending arms, of :i plunger or pisten rod provided With a eone-shzped block for moving the said plates outwu-dly, of it collzu't Secured to the phnger or pisten rod, and adjnsting nuts threaded on the plunger or piston rod, Whereby the ontward movement of the plates is determined, substantiallv as described.

In ai plunger or pisten eomprising sections provided with a paeking ring Secured between the said sections, of ;i plurality of ontwardly movable plates having inwardiy extending arine of inwardiy extending` ribs Secured to the plnng'er or pisten, :i phnger or pisten rod provided With :i eone-shaped block for moving the said plates ontivardly, of a coilar Secured to the piunger or pisten rod, adjnsting nuts threaded onto the phim ger or pisten red, and an inlet vaive mounted in said plunger or pisten, subetantinlly as described.

In testimony Whereof, I have herennto set my hand, in the presence of two sub Seribing witnesses. r

GEORGE A. PEARSE Ju. iVitnesses:

GEORGE H. BOTTS, J. A. GRAVES. 

